Steam-turbine.



' M. BUTTER.

STEAM TURBINE.

APPLICATION FILED JULY 2, 1910.

m mm PatentedJan.5,l915.

INVENTEBR- 1/ I EaY ATTORNEY.

WITNESSES uni mares rants are.

MAX BUTTER, 0F MILWAUKEE, WISCONSIN, ASSIGNOB, BY MESNE ASSIGNMENTS. T0 ALLIS-CHALMEBS MANUFACTURIhTG COMPANY, A CORPORATION OF DELAWARE.

STEAM-TURBINE.

Specification of Letters Patent.

Patented Jan. 5,1915.

Application filed July 2,' 1910. Serial No. 570,064.

To all whom it may concern Be it known that 1, MAX Ro'r'rnn, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Steam- Turbines, (Case A,) of which the following is a specification.

This invention relates to improvements in the construction of steam turbines and in particular to improvements in low pressure turbines using the exhaust steam from some other source as a motive power.

The object of the invention is to provide an automatic means for controlling the pressure of the admission steam to the turbine. In turbines operated by the exhaust steam from another source, it is often found that the steam supplied is not sufficient to operate the turbine. Some means must therefore be furnished for replenishing the supply as soon. as the deficiency occurs. This is done automatically by means of the present invention.

A clear conception of the invention can be obtained by referring to the accompanying drawing.

The drawing shows a central vertical section of a steam turbine and the controlling means therefor.

The main shaft 1 carrying the spindle 2 is supported near its ends by the casing 4. The spindle 2 carries the movable blades 3 while the casing 4 supports the stationary blades 5. The casing .4 also has an admis sion port 7 and an exhaust port 6 formed therein.

The inlet pipe 8 which connects with the admission port 7 terminates in a chamber 27 containing the valve 19. This valve 19 is fixed to the rod 14 and is seated on the seats 20, 21. in the position shown in the drawing. The passage 26 connects the chamber 27 with another valve chamber 24. This chamber 24 connects with the high pressure steam supply pipe 22. As shown, the valve 23, having the through ports 25 is connected to the rod 14 and closes off the connection between the passage 26 and the chamber 24. The chamber 16 above the valve connects with the low pressure steam supply pipe 17 the check valve 18 serving to separate the two.

The rod 14 supporting the valves 19, '23, passes up through the cover plate 15 and has its end connected to one-end of the lever 12. The lever 12 is pivoted at a stationary pivot 13 and has its other end connected to the regulator collar 10. The collar 10 is slidingly mounted on the regulator shaft '11 which supports the regulator 9.

During thenorma'l operation of the turbine the Weights of the regulator 9 are in a lower position than that shown in the drawing. The collar 10 is in a position such that the lever 12 is practically parallel to the axis of the shaft l. This brings the valve 19 to full open position and the valve 23 is raised sothat its lower edge just cuts oil the connection between the chamber '24 and the passage 26. which is used as a motive power is admitted through the supply pipe 17, past the check valve 18 into the chamber 16. From the chamber 16 the steam passes by the valve 19 to the pipe 8. thence through the admission port 7 to the turbine. After passing through the turbine, the steam is exhausted through the port 6 to a condenser.

A high pressure steam supply is in communication with the pipe 22, but under usual conditions of operation none of this steam is admitted to the turbine. If for any reason the supply admitted through the pipe 17 becomes insuflicient to drive the turbine under load, the speed of the turbine will drop off and the regulator 9 will slow down. This will cause the collar 10 to drop, hence raising and opening both the valves 19, 28. As the valve 23 is raised, high pressure steam passes into the passage 26 and chambers 27, 16, and the pipes 8 causing the valve 18 to close and replenishing the supply of steam to the turbine. The admission pressure to the turbine is kept from becoming too great by the regulator 9, which will speed up as the turbine speeds up and shut off the high pressure supply. As soon as the pressure of the steam in the pipe 17 becomes greater than that in the chamber 16, the valve 18 will open admitting low pressure steam in the chamber 16. It will also be seen that if for any reason the pressure in the pipe 17 becomes too great, the collar 10 will be raised sufficiently to automatically close the valves 19, 23. Thus an automatic control of the turbine is The low pressure steam obtained for all conditions of operation of sired to be limited to the exact details of construction shown and described, for obvious modifications .Wlll occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. The combination of a turbine, means for admitting low pressure steam to the admission port of said turbine, a second means for admitting steam at a higher pressure to the same stage of said turbine through said admission port, a common control for said admission means, and a check means in said loW pressure steam admission means.

2. The combination of a low pressure turbine, a valve-controlled source of low pressure supply to the admission port of said turbine, a valve-controlled source of high pressure supply to the said admission port of said turbine, a governor responsive to speed changes of said turbine, means whereby said governor controls the valves of said two sources of supply, and a check means in said low pressure supply source.

3. The combination in a low pressure turbine, of means for admitting to the same,

\ building up of pressure in front thereof by high pressure fluid.

4. The combination in a low pressure turbine, of means for admitting to the same stage of said low pressure turbine both high and low pressure steam, a single governor responsive to speed changes of said turbine for controlling said high and said low pressure admissions, and a check valve in said low pressure admission means to prevent building up of pressure therein in front or said check valve by the admission of high pressure steam.

In testimony, whereof, I aflix my signature in the presence of two Witnesses.

MAX BUTTER.

Witnesses:

H. C. CASE, -W. H. LIEBER' 

